Vaulting mono-crutch
A system for enhancing user mobility can include a support member configured to engage a posterior region of a user and a mast coupled to the support member. The mast can be at least partially lifted and repositioned when the user's weight is shifted to a mobile leg of the user, thereby allowing the user to relocate the mast according to an intended direction of movement. The mast is further configured to receive a force exerted on the support member by the user when the weight of the user is shifted away from the mobile leg of the user, thereby enabling the mobile leg of the user to move from a first location to a second location while the weight of the user is shifted from the mobile leg of the user to the mast via the support member.
The present application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Ser. No. 61/775,684, entitled VAULTING MONO-CRUTCH, By Russell Martin Chadwell, filed Mar. 11, 2013, or is an application of which currently application(s) are entitled to the benefit of the filing date. The above-referenced provisional patent application is hereby incorporated by reference in its entirety.
FIELD OF INVENTIONThe present disclosure generally relates to systems and devices for enhancing user mobility and more particularly to a system for assisting a user that suffers from an impaired leg or an amputation.
BACKGROUNDWhen an individual suffers an injury or an ailment that causes temporary or permanent loss of function in one of the individual's legs, several devices exist to help the individual regain mobility. For example, an impaired individual may use a wheelchair or a crutch depending on the distance being traveled and the individual's ability to compensate for the impaired leg (e.g. status of the individual's other leg, ability to balance, and/or upper body strength). Many users prefer crutches because they enable unassisted navigation up and down stairs and because they enable users to remain mobile in an upright position. Crutches are also more portable and they provide a greater ability to maneuver through doorways, corridors, in and out of vehicles, and around other individuals.
The most commonly used crutches enable a user to compensate for an impaired or missing leg with the user's upper body. To compensate for the user's inability to shift weight from leg to leg, the user shifts weight from the user's mobile (unimpaired) leg to a pair of crutches resting under the user's armpits or forearms. The user is thus enabled to step with the mobile leg while the user's weight is supported by the crutches. However, because of their typical placement, these crutches impose significant strain on the user's upper body and often cause rashes, welts, and/or chafing under the user's armpits or forearms. There is a great need for systems or devices that allow user mobility in an upright position without the deficiencies of currently employed crutches.
SUMMARYThis disclosure is directed to a system for enhancing user mobility by enabling an impaired user to shift weight away from a mobile leg of the user without causing significant strain on the user's upper body or engaging the user in a manner that causes discomfort around the user's armpits or forearms. In accordance with various embodiments of the disclosure, the system includes a support member configured to engage a posterior region of a user, such as the user's buttocks and/or a backside portion of the user just below the user's buttocks (e.g. upper thigh region). The system further includes a mast that is coupled to the support member and is configured to be at least partially lifted from the ground and repositioned when a weight of the user is shifted to a mobile leg of the user. Accordingly, the user may relocate the mast based upon an intended direction of movement (i.e. based upon where the user is planning to step), similar to the manner by which the user would locate a common crutch. Unlike a common crutch, however, the mast is configured to receive a force exerted on the support member by the posterior region of the user when the user's weight is shifted away from the mobile leg of the user. Weight is shifted to the mast through the user's posterior region, thereby allowing the mobile leg of the user to move from a first location to a second location.
The user is enabled to walk for extended periods of time without suffering significant upper body strain or uncomfortable contact because the support member engages the user's posterior region much like the seat of a swing or a parachute harness. While the user steps with the mobile leg, the user's weight is temporarily suspended from the mast via the support member, and as the user raises the mobile leg to step, the transferred weight is stored as potential energy. For example, gravitational forces, tension, and/or user forces cause the mast to be brought to an upright position and may further cause a distortion in the mast and/or a resilient foot coupled to a lower portion of the mast. Much like a reversed pendulum, any energy stored by the mast is released during the downward arc of the step to vault the user in the direction of movement. In embodiments including a semi-resilient mast and/or a resilient foot coupled to the mast, spring forces may further vault and/or stabilize the user as the mast and/or the resilient foot returns to an undistorted state. The system compensates for an impaired or missing leg by preserving the mechanics of a user's walking motion because the user's weight is transferred to the mast through the user's posterior region just as if the user was capable of shifting weight from leg to leg. The operational comfort of the system and its preservation natural walking mechanics will be greatly appreciated by users requiring prolonged or permanent mobility assistance.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not necessarily restrictive of the present disclosure. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate subject matter of the disclosure. Together, the descriptions and the drawings serve to explain the principles of the disclosure.
The various embodiments of the disclosure may be better understood by those skilled in the art by reference to the accompanying figures in which:
Reference will now be made in detail to the subject matter disclosed, which is illustrated in the accompanying drawings.
The mast 104 is configured to be at least partially lifted from the ground and repositioned when the user's weight is shifted to the mobile leg 202, thus allowing the user 200 to relocate the mast 104 based upon an intended direction of movement (i.e. based upon where the user is planning to step), similar to the manner by which the user 200 would relocate a common crutch. Unlike a common crutch, however, the mast 104 is configured to receive a force exerted on the support member 102 by the posterior region 206 of the user 200 when the user's weight is shifted away from the mobile leg 202. For example, as shown in
As shown in several of the figures and discussed in accordance with various embodiments, the system 100 can be employed by users 200 having an impaired leg 204 and those suffering an amputation (i.e. missing some or all of one leg) because the mast 104 is enabled to compensate entirely for the supportive function of an impaired or missing leg of the user 200. Thus, it should be understood that the various embodiments system 100 which are described herein are intended for two-legged or one-legged users 200.
Looking now to
Further, as shown in
An exemplary embodiment of the harness is further illustrated in
At the right and left hip-areas of the user 200, the torso straps may join to a pair of torso-to-seat strap, three-way fasteners. The three-way fasteners serve to connect the torso straps to a seat strap defining at least a portion of the support member 102 that is configured to engage the posterior region 206 of the user 200. The seat strap may be made from a thicker, stronger, or reinforced material in comparison to the torso or leg straps. The seat strap may further include comfort padding along a region between the support member 102 and the posterior region 206 of the user 200. A leg strap fastener may be attached at an angle to the seat strap, serving to anchor an end of a leg strap defining at least a portion of the lower fitting 110 and/or to anchor an end of an optional lower waist strap defining at least a portion of the upper fitting 108.
A first lower fitting 110 and (in some embodiments) a second lower fitting 112 may be defined by a pair of detachable leg straps connected to the three-way fasteners, on either side of the user's hips. The leg straps may serve to stabilize the user 200 onto the seat strap, allowing the user 200 to sit on the seat strap much like a seat of a playground swing set. The leg straps, when connected to the three-way fasteners may define loops configured to receive the user's legs 202 and 204, thus defining the lower fittings 110 and 112. A leg strap adjustment buckle may be connected into each leg-strap fastener to allow configuration of the leg strap length according to the user's needs. As discussed above, the leg straps may be detachable, thus allowing the user to configure the harness for one-legged or two-legged operation. If the user 200 is missing a leg, one of the leg straps may be detached from a respective one of the three-way fasteners and a respective seat strap connection. The leg strap may be replaced with an optional lower-waist strap configured to connect via the leg strap fastener to the seat strap. The lower-waist strap may cross over the front side of the user's lower waist, reaching around to the opposite-side leg strap in a manner that better secures the one-legged user onto the seat (as shown in
In an exemplary embodiment, the attachment portion 116 (i.e. the crutch-to-harness connection) may include a tubular chest bar that is connected to the D-rings by way of a set of small o-rings or any other fastener that provides a strong mounting point between harness and the structural arm 106 of the mast 104. A small u-bar connects the chest bar to the structural arm 106 by way of a high-strength quick-release pin. This allows the user to disconnect from the mast 104 for any number of reasons. In some embodiments, the quick-release pin joins the chest bar to the structural arm 106, while the structural arm 106 is joined to the mast 104 via an elbow connection. Alternatively, the structural arm 106 may be integrated with or welded to the mast 104. In some embodiments, the mast further includes a height-adjustment tube, which may be coupled with the elbow connection. The adjustment tube may include various adjustment holes configured to receive a locking pin at a selected height of the mast 104. Accordingly, the mast 104 may be enabled extended from or collapsed into the adjustment tube according to a selected length of the mast 104. The mast 104 may be formed from a rigid (e.g. steel) or a semi-rigid material (e.g. fiberglass or isophthalic polyester resin) and may have one or more pin holes aligned in such way that when slid inside the adjustment tube, the matching hole-patterns provide an interface for anchoring the crutch at a given height with one or more pins (slid through the aligned holes). In some embodiments, the adjustment tube may include alternative adjustment couplings such as, but not limited to, a crank configured to actuate rigid tooth-like structures or notches along a portion of the mast 104, a pressurized canister (as often used for desk chairs), a locking lever (as often used for bicycle seat or handle bar adjustments), or cooperative threading (i.e. a screw-style coupling between a portion of the mast 104 and the adjustment tube).
In some embodiments, the adjustment tube may further include at least one actuator, such as a motor, configured to raise and lower the tube relative to the rest of the mast 104. Accordingly, the mast height may be electronically controlled using a switch, which may be located, for example, in a handle coupled to the mast 104. It is further contemplated that an electronically adjustable mast 104 may be configured to responsively shorten or lengthen according to the user's gait. For example, the mast 104 may be configured to shorten during relocation so that the user 104 is not required to swing the mast 104 outwards.
In some embodiments, where the mast 104 is formed from a semi-rigid or semi-resilient material, the resiliency allows the user 200 to make minor upper-body movements in order to adjust his or her center of mass while stepping with the mobile leg 202. The mast 104 may slightly distort as weight is shifted to the mast 104 and push the user 200 back to center with a restoring force as the mast 104 returns to an undistorted state. As shown in
As shown in
In an exemplary embodiment, the mast 104 may further include a traction tip, providing slip-resistant traction with the ground. As discussed above, the mast may further include one or more optional components for providing additional control or comfort. For example, the optional handle 118 may be affixed along the mast 104 in order to provide the user 200 with a better grasp of the mast 104. If more control is desired, the mast 104 may further include the forearm support member 122 with one or more straps affixing the user to the mast 104 itself (as shown in
Moreover, the system 100 is highly configurable according to the user's needs. For example, heavy-chested or overweight users may find better comfort utilizing an embodiment like that shown in
Numerous advantages of the system 100 will be appreciated by those skilled in the art. For example, this system 100 maintains tension, gravitational, and incidental forces at a point near the hip joint, as it should be, instead of on hands, under arms and so forth, as seen in common crutches. The system 100 also allows the user 200 to maintain a free hand, as only one hand is needed to control the mast 104 at all times, unlike crutches which are typically operated in pairs. The system 100 also offers several advantages over prosthetics. For example, because it is highly reconfigurable, the system 100 may be provided to users at a much lower cost than prosthetics, which can run anywhere from $5,000 to $50,000. The cost advantages are multiplied when one considers that prosthetics, due to their complex nature, often need to be replaced due to wear, sometimes in as little as four to five years. The adjustable nature of the system 100 also allows any user 200 to begin learning to navigate with much less training, unlike prosthetics, which must be highly customized to the user's body and may require extensive training periods.
Additionally, leg prosthetics for above-the-knee amputations are known to exhibit low performance in negotiation of steep inclines. There are a few prosthetics that perform well on inclined hills, and these are typically top-end (very expensive) models. The problem is that when a user tries to bring the artificial foot of a prosthetic up to the same level as the good foot and then tries to advance the good foot up to the next higher point, the user is left on the toe of the artificial foot and the length of the artificial foot allows the user to roll back onto its heel. This potentially launches the user off in an inappropriate direction (e.g. backwards). The mechanical knee is also not powered in such a way that it can lift the user up to the next higher point. Rather, the mechanical knee typically has enough spring power only to put the foot in a more forward position while on nearly-level ground. When attempting to move the foot to a significantly higher point than it was previously, the width and length of the artificial foot becomes an issue. The mast 104 described above includes a small, tapered end that is not susceptible to this scenario. The user 200 simply advances the mobile leg 202 to the higher point and brings the mast 104 up to the same level.
It will be understood by those within the art that, in general, terms used herein, and are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations.
In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.).
In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
Although particular embodiments of this invention have been illustrated, it is apparent that various modifications and embodiments of the invention may be made by those skilled in the art without departing from the scope and spirit of the foregoing disclosure. Accordingly, the scope of the invention should be limited only by the claims appended hereto.
Claims
1. A system for enhancing user mobility, comprising:
- a support member configured to engage a posterior region of a user;
- a mast coupled to the support member, the mast being configured to be at least partially lifted from the ground and repositioned when a weight of the user is shifted to a mobile leg of the user, the mast being further configured to receive a force exerted on the support member by the user when the weight of the user is shifted away from the mobile leg of the user, wherein the mobile leg of the user is enabled to move from a first location to a second location when the weight of the user is shifted from the mobile leg of the user to the mast via the support member; and
- a structural arm extending from a top portion of the mast at least half way across the user's chest or upper abdomen, the structural arm being configured to suspend the support member from a suspension point near the center of the user's chest or upper abdomen such that the support member carries the user and is fully suspended from the structural arm as the weight of the user is shifted away from the mobile leg of the user, wherein the structural arm is structured to extend across a frontside of the user such that the mast and the structural arm are maintained in front of, and not in contact with, the user's armpits.
2. The system of claim 1, wherein the mast is further configured to distort as the force is exerted on the support member by the user, thereby storing energy from the force, and wherein the mast is further configured to exert a restoring force as the mast returns to an undistorted state, thereby propelling the user as the mobile leg of the user is moved from the first location to the second location.
3. The system of claim 1, wherein the mast includes a structural foot extending from a lower portion of the mast, the structural foot being configured to stabilize the mast as the mobile leg of the user is moved from the first location to the second location.
4. The system of claim 3, wherein the structural foot is further configured to distort as the force is exerted on the support member by the user, thereby storing energy from the force, and wherein the structural foot is further configured to exert a restoring force as the structural foot returns to an undistorted state, thereby propelling the user as the mobile leg of the user is moved from the first location to the second location.
5. The system of claim 4, wherein the structural foot comprises at least one of a spring-loaded foot or an outwardly projecting fin.
6. The system of claim 1, wherein the length of the mast is greater than or equal to a distance from the ground to the user's chest.
7. The system of claim 1, wherein the posterior region of the user includes at least a portion of the user's buttocks or a backside portion of the user that is located below the user's buttocks.
8. The system of claim 1, wherein the mast includes a handle for controlling the mast with an arm of the user that is opposite to the mobile leg of the user.
9. The system of claim 8, wherein the mast further comprises a forearm support member coupled to the handle, the forearm support member being located at a position on the mast suitable for resting the user's forearm when the user is in a standing in an upright position.
10. A system for enhancing user mobility, comprising:
- a harness including: a support member configured to engage a posterior region of a user; an upper fitting configured to receive a portion of the user's torso; and a lower fitting configured to receive a portion of a mobile leg of the user, the upper fitting and the lower fitting of the harness being coupled with the support member and configured to maintain the support member in proximity of the posterior region of the user; and
- a mast configured to be controlled by the user with an arm opposite to the mobile leg of the user, the mast being configured to be at least partially lifted from the ground and repositioned when a weight of the user is shifted to a mobile leg of the user, the mast including a structural arm extending from a top portion of the mast to a location proximate to the user's chest or upper abdomen, the structural arm being coupled to the support member and being configured to transfer a force exerted on the support member by the user to the mast as the weight of the user is shifted away from the mobile leg of the user such that the support member carries the user and is suspended from the structural arm, wherein the mobile leg of the user is enabled to move from a first location to a second location when the weight of the user is shifted from the mobile leg of the user to the mast via the support member that is suspended from the structural arm, and wherein the structural arm is structured to extend across a frontside of the user such that the mast and the structural arm are maintained in front of, and not in contact with, the user's armpits.
11. The system of claim 10, wherein the mast is further configured to distort as the force is exerted on the support member by the user, thereby storing energy from the force, and wherein the mast is further configured to exert a restoring force as the mast returns to an undistorted state, thereby propelling the user as the mobile leg of the user is moved from the first location to the second location.
12. The system of claim 10, wherein the mast further includes a structural foot extending from a lower portion of the mast, the structural foot being configured to stabilize the mast as the mobile leg of the user is moved from the first location to the second location.
13. The system of claim 12, wherein the structural foot is further configured to distort as the force is exerted on the support member by the user, thereby storing energy from the force, and wherein the structural foot is further configured to exert a restoring force as the structural foot returns to an undistorted state, thereby propelling the user as the mobile leg of the user is moved from the first location to the second location.
14. The system of claim 10, wherein the harness further includes two side fittings configured to receive a portion of the user's shoulders, the two side fittings being coupled to the support member and configured to maintain an attachment portion of the support member in proximity of the user's chest or upper abdomen, the attachment portion of the support member being configured to couple with the structural arm of the mast.
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Type: Grant
Filed: Mar 10, 2014
Date of Patent: Sep 22, 2015
Inventor: Russell Martin Chadwell (Omaha, NE)
Primary Examiner: Noah Chandler Hawk
Application Number: 14/202,917
